React Native UIKit filtering by metadata

// Detailed description of issue.
I am trying to filter the channelList based on metadata. I was able to write a queryCreator like in the specification but

WARN [UIKIT_ios] queryCreator is ignored, please use collectionCreator instead.

So I am trying to use collectionCreator but it seems there is no way to make this kind of filters and does not seems to find any documentation or sample with this

// If problem, please fill out the below. If question, please delete.
[UIKit Version]
// What version of the SDK are you using?
@sendbird/chat”: “^4.2.0”,
@sendbird/uikit-react-native”: “^2.1.0”,

[Current impact]
// How is this currently impacting your implementation?

Blocking. We are currently investing different Chat provider like you( yours and 2 others).
This feature, filtering by metadata is mandatory for your idea.